That’s new in 1.85.4 I think - I don’t have that argument in 1.85.3. Though that doesn’t explain why you are getting the error on 1.85.4.

Ahh, I was looking in the source code for my developer installation but was actually running the code on the 1.85.4 Standalone. The clearEvents parameter must still be upstream only and not yet released. Unfortunately; the online API documents are ahead of the released version.